I'll take no prisoners in this debate. We are supposed to have commercial vehicles and as such I expect them to be filled at a commercial filling station like a truck stop, with the nozzle on its fastest setting. Why should I expect to use a half speed setting?

I have filled at the RV island (once) and at a convenience store (once), and it took so long it wasn't worth it.

I have tried filling both sides simultaneously, the drivers side only (that really pukes a lot), and the passenger side only (that pukes, but much less dramatically). On my other coach, about a minute before the nozzle shut itself off you could hear a gurgle in the filler pipe which got progressively louder. At that point you could see the foam disappear back down the pipe.

Now you hear the gurgle at the same instant about a pint of fuel shoots out the pipe. There is no way to even contemplate "topping off" because it seems an amount equal to what is coming from the nozzle comes out at you. My current practice is to never get closer than 3 feet to the side of the nozzle while it is pumping, and when it simultaneously pukes and shuts off I am done.

FWIW I have the standard 208 gallon tank and the optional 90 gallon auxiliary tank, so fortunately I don't have to fuel very much.